Solutions of less than 20% HF can produce pain and redness with delay up to 24 hours after skin exposure. 20 to 50% HF produces pain and redness within 8 hours, and solutions of more than 50% produce immediate burning, redness and blister formation. Contact of the skin with the anhydrous liquid produces severe burns

Eyes :

• Consult an ophthalmologist immediately in all cases.
• Take to a hospital immediately.
• Flush eyes as soon as possible with running water for 15 minutes, while keeping the eyelids wide open.
• Rinse the eyes with calcium gluconate (1% solution in physiological serum) (10 ml of calcium gluconate 10% in 90 ml of physiological serum).
• In case of difficulty opening the lids, administer an analgesic eyewash (oxybuprocaine).

A case of fluoride poisoning of a girl aged 2(1/2) years is reported. "Although the possibility of ingestion was originally denied by the mother, repeated questioning revealed that prior to becoming ill the child had been playing with a laundry powder. The mother had obtained this material from a commercial laundry. The powder was identified as "Bayline Brand Laundry Sour" (manufactured by BASF Wyandotte, Michigan), a whitener sold only to commercial laundries. This contained sodium silicofluoride (Na2SiF6) as its major ingredient ..."